Figure 6.
Conceptual model of intra‐ and extracellular O2 concentrations in Trichodesmium at different times of the day. Note that (nonphotosynthetic) diazocytes are always anoxic, while O2 concentrations in vegetative (photosynthetic) cells vary with time of the day and morphology (colony vs free trichomes). Estimates are based on O2 measurements (by microsensors and membrane inlet mass spectrometry (MIMS)) and model calculations, assuming the same photosynthesis rate and permeability for all cells. Red pattern in and around cells indicates O2 concentration, grey and green backgrounds indicate vegetative cells and diazocytes, respectively.